At this point, if they don't come out with a decent bump, it's going to be a let down. Why hold back? They're probably planning on releasing specs on the same day the order banks open.
That would lead me to believe it’s a modest bump at best. Otherwise Ford would be touting it. Is it that hard to squeeze another 50HP 550+TQ and still be in the same mileage ballpark and emissions? This would be an acceptable increase and the same from Gen1 to Gen2 give or take. Unless they are truly putting all the power into the R and let those people who want it, come get it.